Patent GB-530587-A (GB)
Title: Improvement in dental equipment stands
IPC: A61G15/14
Filed: 1939-06-24
Abstract: 530,587. Dental equipment stands. GROSE, S. J. (White Dental Manufacturing Co., S. S.). June 24, 1939, No. 18437. [Class 81 (ii)] [Also in Groups XXIV, XXV and XXXVII] A dental equipment stand is built up of superposed frame sections arranged about a common vertical axis about which axis movable sections are adapted to rotate and aligned with which axis are a motor and extension shaft adapted to drive a dental engine disposed adjacent the top of the structure. Pipes n are disposed within the structure which is encased by flexible sections adapted to yield in case of gas explosion. As shown in Fig. 2, the stand includes a swivelling cuspidor 429, a water niche 361, a swivelling bracket arm 170 supporting an instrument table 632 and a swivel bracket 80 supporting the dental engine 83-86. The frame sections comprise a floor section 1, Fig. 3, a main supporting section 2, cuspidor and water niche section 3, bracket-arm section 4 and motor section 5, the sections being aligned by flanges and secured together by bolts. The motor section 5, Fig. 9, comprises diametrical members 67 terminating in an annular bead 69 forming a pocket 70 supporting a cylindrical hub 71 on which is threaded a flanged member 75 rotatably supporting a flanged swivel ring 79 carrying the bracket 80. A sleeve 100, having a flange 101 threaded into the hub 71, supports bearings 97, 99 for an extension shaft 93 carrying the driving pulley 92. The motor 95 is resiliently supported at 133 in a cradle 125 whereby it may be swung out, on pintals 126, 127, for inspection, being normally aligned with the extension shaft by means of a stop lug 146 on the cradle engaging a stop 147 on the frame and held by a clamping- screw 150. A flexible coupling between the shaft 93 and motor shaft 103 comprises a core 115 furnished with rubber &c. flanges encircled by metal rims 116, 117 of which the rim 117 is permanently engaged in a thimble 105 secured to the shaft 97 by a screw 106 and the rim 117 is permanently engaged in a ring 118 adapted to be secured by key 122 and screw 123 to a collar 107 which is secured to shaft 103 by key 109 and screw 111; by loosening screws 111, 123 the collar 107 may be lowered to free the motor for lateral withdrawal. The bracket arm 170, Figs. 3, 9 or 6, comprises side bars 171, 172 merging outwardly into an annular support 173 for an accessory table and terminating inwardly in a semicircular portion 175 the free ends of which are connected by a yoke 179 to form an annular structure encircling a hub 54 on frame section 4. Rollers 185, 186 engaging a lower track 44 and a roller 187 engaging an upper track 60 support the arm for rotation and it is registered axially by rollers 200, 201, 202 engaging a cylindrical track 41 on frame section 3. Movement of the arm is restricted by a brake device 221 comprising a pair of friction jaws adjustably engaging a friction ring 217 clamped between frame sections 3 and 4; the arm is also locked against movement by a pair of friction balls 251, 252, Fig. 31, forced together by springs and forced into contact with the ring 217 by cam surfaces 249, 250, and is released and moved in either direction by a push-pull member 300 operating a T lever 281 carrying headed studs 289, 290 engaging elongated slots in a yoke 280 which is connected through a rod 279a to a lever arm 276 adapted to move inwardly a plunger 269 to separate the balls. The cuspidor is supported by arm 393, Fig. 13, furnished with a room 405 engaging a circular rib 49 with which it is retained in swivelling engagement of a strap 406, movement of the arm being limited, in either direction, by an upstanding lug on the rim engaging a stop 415. The cuspidor 429 is secured by an annular nut 450 upon a resilient seal 443 within the outer end of a drain conduit 431 which terminates in an inner portion adapted to swivel about an axial drain pipe 462, Fig. 8, and also about a drain pipe 388 from the water niche 361. The water niche is adapted to house a glass 365 supported upon a perforated shelf 366 within a basin 383. Water is supplied from a pipe 315 to a main valve 316 from which the water niche is supplied via pipes 347, 356 and valve 370 and to the cuspidor through flexible pipe 500 and valve block 501 which is furnished with three valves 509, 525 and 562, Fig. 10, controlling supply of water respectively to a swivelling cuspidor flush nozzle 519, a water heater and a saliva ejector 537. The saliva ejector 537 is supported in a bracket 539 and is connected by a flexible tube 536 to a chamber 529, Fig. 13, connected via pipes and a water ejector pump to an outlet 527 in the conduit 431. Valve 562 controls flow of water through an electric heater and also a bypass for unheated water to a syringe 576, Fig. 10, supported in a holder 571 adapted to be electrically heated. The bracket arm 170, Figs. 2, 3 and 16, is furnished with an annular mounting 173 to receive the ring 628 of a bracket table 638 carrying accessories. A shielded gas burner 634 is carried by an arm 635 pivotally supported by a tube 639, provided with a valve 638, connected through a hollow fitting 640, pipes 705, 701, and flexible tube 665, Fig. 17, to a gas inlet pipe 657 which is supplied from a gas service pipe extending upwardly through the stand via a valve 162, Fig. 2. The tube 665, Fig. 17, is spirally coiled upon and slidably supported by an annular shelf 62. Compressed air is supplied from a service pipe extending upwardly through the stand to a valve 164, Fig. 2, and thence through an air filter and pressure regulator to a pipe 737, Fig. 17, leading to a flexible tube 745 spirally supported upon flange 58 and connected through a pipe 759 to a pipe 762 leading into the annular mounting 173 from where it may be extended into the table for connection to air dispensing instruments. Water is drained from the air filter through a valved vent 772, Fig. 2. Electric current is supplied through a cable to a resistor panel housed in the frame section 2 and thence to the motor through a foot-controller adapted to control both direction and speed of the motor. The resistor panel is also connected through cable 29, Fig. 8, to a low-voltage transformer 631 housed in section 5 from which current passes through main switch 162, Fig. 2, and regulating-switch 160 to the water heater. Current is also supplied through leads 901, 902, Fig. 16, via a booster transformer 890, controlled by switch 900, to instruments, e.g. a cantery or pulp tester; also through other leads to other instruments, e.g. a mouth lamp or wax working instrument, the instrument being housed in the table 632, Fig. 2 The ring support 628 for the table 632 may be replaced by an arm 036, Fig. 42, carrying a movable spray warmer 041, provided with receptacles 042, 043 for spray bottles and a receptacle 044 for a water tumbler ; the arm also supports an X-ray illuminator 1150. Electric current is supplied to the spray warmer through a lever 098, Fig. 50, carrying a contact 092 and magnetic keeper 097; the lever is connected to a thermostat comprising a coiled, bimetallic strip 1100 which is adjustable through a knob 1135, rack gear 1130 and lever 1109 to regulate the temperature. An articulated spotlight may be rotatably mounted upon the motor section by means of a sleeve replacing the spacer sleeve 74, Fig. 9. The frame sections are enclosed by hemicylindrical, sheet-metal sections having abutting flanges engaging notches n in the frame sections and retained by girdling bands. The cuspidor and arm 270 are also enclosed by sheet-metal members.